The correct valid declaration is boolean b1 = false.People also ask, which is valid declaration of a string?
Discussion Forum
| Que. | Which is a valid declarations of a String? |
| b. | String s2 = 'null'; |
| c. | String s3 = (String) 'abc'; |
| d. | String s4 = (String) 'ufeed'; |
| Answer:String s1 = null; |
Additionally, which is a valid declaration within an interface? A public access modifier is acceptable. The method prototypes in an interface are all abstract by virtue of their declaration, and should not be declared abstract. Option B is wrong. The final modifier means that this method cannot be constructed in a subclass.
Similarly, which is valid declaration of float?
| 1) | float f = 1.0; |
| 2) | float f = 1F; |
| 3) | float f = 1.0d; |
| 4) | float f = "1"; |
| 5) | NULL |
Which three are valid declarations of a char?
char C1 = 064770;char C2 = 'face';char C3 = 0xbeef;char C4 = u0022;char C5 = 'iface';char C6 = 'uface';A. 1, 2, 4B. 1, 3, 6C.
What is string in Java?
String is a sequence of characters, for e.g. “Hello” is a string of 5 characters. In java, string is an immutable object which means it is constant and can cannot be changed once it has been created.Which is a valid keyword in Java?
Which is a valid keyword in java? Explanation: interface is a valid keyword. Option B is wrong because although "String" is a class type in Java, "string" is not a keyword.Which one is true about a constructor?
What is true about constructor? Explanation: Constructor returns a new object with variables defined as in the class. Instance variables are newly created and only one copy of static variables are created. Explanation: No instance can be created of abstract class.What is the numerical range of char?
0 to 65535
What is the use of final keyword in Java?
final keyword in Java. final is a non-access modifier for Java elements. The final modifier is used for finalizing the implementations of classes, methods, and variables.Which of these values can a Boolean variable contain?
Explanation: Boolean variable can contain only one of two possible values, true and false.What is the output of relational operators?
The output of the relational operator is (true/false) boolean value, and in Java, true or false is a non-numeric value that is not related to zero or one.Which data type value is returned by all transcendental math functions?
Only double data type value is returned by all transcendental math functions.Which of the following will directly stop the execution of a thread?
Which of the following will directly stop the execution of a Thread? Explanation: Option A is correct. wait() causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object.Which of these Cannot be used for a variable name in Java?
You cannot use keywords like int , for , class etc as variable name (or identifiers) as they are part of the Java programming language syntax. Here's the complete list of all keywords in Java programming.Which operator is used to invert all the digits in binary representation of a number?
not operator
What is the process of defining more than one method in a class differentiated by method signature?
Explanation: Function overloading is a process of defining more than one method in a class with same name differentiated by function signature i:e return type or parameters type and number. Explanation: A constructor is a method that initializes an object immediately upon creation.What is stored in the object obj in following lines of code?
What is the stored in the object obj in following lines of Java code? Explanation: Memory is allocated to an object using new operator. box obj; just declares a reference to object, no memory is allocated to it hence it points to NULL. This reference is address in memory of the object allocated by new.Which of these operators is used to allocate memory to array variable in Java?
Operator new allocates block of memory specified by the size of array, and gives the reference of memory allocated to the array variable. Explanation:Operator new allocates block of memory specified by the size of array, and gives the reference of memory allocated to the array variable.Which of the following can be operands of arithmetic operators?
Explanation: The operand of arithmetic operators can be any of numeric or character type, But not boolean. 2. Modulus operator, %, can be applied to which of these? Explanation: Modulus operator can be applied to both integers and floating point numbers.Which is valid in a class that extends Class A?
Which is valid in a class that extends class A? Explanation: Option A is correct - because the class that extends A is just simply overriding method1. The different return type means that the method is not overriding but the same argument list means that the method is not overloading.What is the most restrictive access modifier?
Private Access Modifier - Private Methods, variables, and constructors that are declared private can only be accessed within the declared class itself. Private access modifier is the most restrictive access level. Class and interfaces cannot be private. 
